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San Tan Valley, AZ Weather. The average temperature of San Tan Valley is 71.43Â°F, which is much higher than the Arizona average temperature of 65.97Â°F and is much higher than the national average temperature of 54.45Â°F. Historical Weather. Heating Cost Index, #76.
The average spring temperature in Calistoga is 72 degrees, making it great for a weekend getaway. Summer warms the valley with average daytime temperatures in the 90âs, with very temperate nights. While San Francisco is experiencing foggy days, the short drive to the Napa Valley will reward you with a completely different environment. Fall is when the leaves change and Napa Valley is full of color.